WO2009039678A1 - Procédé et appareil de relais combiné pour une pluralité de stations relais dans un réseau de communication sans fil - Google Patents

Procédé et appareil de relais combiné pour une pluralité de stations relais dans un réseau de communication sans fil Download PDF

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Publication number
WO2009039678A1
WO2009039678A1 PCT/CN2007/002817 CN2007002817W WO2009039678A1 WO 2009039678 A1 WO2009039678 A1 WO 2009039678A1 CN 2007002817 W CN2007002817 W CN 2007002817W WO 2009039678 A1 WO2009039678 A1 WO 2009039678A1
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WIPO (PCT)
Prior art keywords
weighting
signal
relay
related information
weighted
Prior art date
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PCT/CN2007/002817
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English (en)
Chinese (zh)
Inventor
Xiaolong Zhu
Dong Li
Original Assignee
Alcatel Shanghai Bell Company, Ltd.
Alcatel Lucent
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Alcatel Shanghai Bell Company, Ltd., Alcatel Lucent filed Critical Alcatel Shanghai Bell Company, Ltd.
Priority to CN200780100382.3A priority Critical patent/CN101785213B/zh
Priority to PCT/CN2007/002817 priority patent/WO2009039678A1/fr
Publication of WO2009039678A1 publication Critical patent/WO2009039678A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations

Definitions

  • the present invention relates to a wireless relay network, and more particularly to a method and apparatus for transmitting signals by a multiple relay station in conjunction with a next hop device in a wireless relay network.
  • joint relay In a wireless communication network, the introduction of a relay station helps to expand the coverage area of the cell and increase the data throughput rate of the cell. With the development of relay technology, a joint relay scheme has emerged, called joint relay, that is, multiple relay stations transmit signals to the next hop device. With the joint relay technology, multiple transmit antennas distributed over multiple relay stations can achieve gains such as spatial multiplexing and spatial diversity. Because of the above advantages, joint relay plays a pivotal role in the relay network.
  • the open-loop mode is most typically an adaptive distributed space-time coding (ADSTC) as shown in FIG. 1a, in which two relay stations are each provided with one transmitting antenna.
  • ADSTC adaptive distributed space-time coding
  • the relay stations B and C adopt the Alamoti coding mode, and the relay stations B and C respectively respectively modulate the symbol sequence ⁇ X,, X 2 , X 3 ... ⁇ performs space-time coding, and transmits signals to the next hop device (for example, base station D) in units of every two symbols and every two time slots by:
  • X is sent by the relay station B, and the relay station C issues X 2 ;
  • X 3 is sent by the relay station B, and the relay station C issues X 4 ;
  • relay stations B and C constitute a distributed space-time coding system capable of obtaining spatial diversity gain.
  • the signals transmitted by the relay stations do not utilize any channel information, and thus, the array gain cannot be obtained, and the system performance is further improved.
  • the coding matrix used by ADTTC is 2x2
  • the Alamouti matrix is therefore only suitable for the case where two relay stations are jointly relayed and each relay station has only one transmit antenna. In other words, if there are more than two relay stations participating in the joint relay, the extra relay stations will be idle; if the total number of transmit antennas configured by each relay station participating in the joint relay is greater than 2, the extra antennas will also be idle.
  • the closed-loop approach is most typically distributed precoding as shown in Figure lb, where two relay stations are each equipped with a transmit antenna. Still taking the above-mentioned signal transmission as an example, the relay stations B, C, after receiving the signal sent by the previous hop device, such as the mobile terminal, precode the XX 2 using a 2 x 2 precoding matrix.
  • the generation of the precoding matrix depends on channel related information (for example, the channel response between each relay station and the base station D), and the calculation of the matrix is usually completed by the base station, and the corresponding precoding coefficient is notified to the corresponding relay station.
  • the relay station needs to perform more complex baseband processing and correspondingly increase the processing complexity of the receiving end.
  • the present invention provides a new joint relay scheme, where multiple relay station pairs participating in the joint relay are provided.
  • the N-way to-be-transmitted signals in the M-channel to be transmitted signal are weighted, and the N-channel weighted-to-be-transmitted signal and the MN-channel unweighted processed to-be-transmitted signal are generated and jointly sent to the next hop device. Accordingly, the present invention is distinguished from the simple open-loop or closed-loop method in the prior art, achieving a combination of the two.
  • the weighting factor (coefficient) used by the weighting process and the channel related information between the relay stations and the next hop device are associated, thereby facilitating improvement Received signal quality at the next hop device.
  • a method for transmitting a signal to a next hop device in conjunction with another relay station in a multi-antenna relay station of a wireless relay network includes the following steps And performing weighting processing on one or more of the multi-path signals to generate one or more weighted processed signals to be transmitted; and performing one or more weighted processing to be sent The signal and the remaining unweighted signals to be transmitted are sent to the next hop device.
  • a method for transmitting a signal to a next hop device in conjunction with another relay station in a single antenna relay station of a wireless relay network includes the following steps: using a weighting coefficient to treat the weighted signal Performing weighting to generate a weighted processed signal to be transmitted, wherein the weighting coefficient is used to maximize the received signal quality at the next hop device; and sending the weighted processed signal to be sent to The next hop device.
  • a method for controlling a plurality of relay stations to jointly transmit signals to a next hop device in a base station of a wireless relay network includes the following steps: One or more relay stations provide weighting coefficient related information for weighting the weighted signals to be processed by the one or more relay stations.
  • a first joint transmitting apparatus for transmitting a signal to a next hop device in conjunction with another relay station in a multi-antenna relay station of a wireless relay network, including: a first weighting device And performing weighting processing on one or more to-be-weighted signals in the multi-path signal by using a weighting coefficient to generate one or more weight-processed signals to be transmitted; a first signal sending device, configured to use the one-way or The multipath weighted signal to be transmitted and the remaining unweighted signals to be transmitted are sent to the next hop device.
  • a second joint transmitting apparatus for transmitting a signal to a next hop device in conjunction with another relay station in a single antenna relay station of a wireless relay network, wherein: , used to treat weights with weighting factors The weight signal is weighted to generate a weighted processed signal to be transmitted, wherein the weighting coefficient is used to maximize the received signal quality at the next hop device; and the second signal transmitting device is configured to The weighted processed signal to be transmitted is sent to the next hop device.
  • a method for transmitting a signal to a multi-relay station in conjunction with a next hop device in a wireless relay network comprising the steps of: one of the plurality of relay stations or The plurality of relay stations perform weighting processing on the N-way to-weight-weighted signals in the M-channel signals to generate N-channel weighted-to-be-transmitted signals and MN-channel unweighted processed signals to be transmitted, where M is a positive integer greater than 1. And N is a positive integer greater than zero and less than M; the plurality of relay stations send the N-channel weighted to-be-transmitted signal and the MN-channel unweighted to-be-sent signal to the next hop device.
  • a method for detecting a received signal jointly transmitted by a multiple relay station in a network device of a wireless relay network comprising the steps of: Channel-related information between the device and each group of matching antennas of the plurality of relay stations, and weighting coefficients used by the corresponding relay station to weight the weighted signals, and generating equivalent channel-related information for signals transmitted by the respective sets of matched antennas And detecting, by using the generated equivalent channel related information, the received signal jointly transmitted by the plurality of relay stations.
  • the signal transmitted by the line generates equivalent channel related information
  • the detecting means is configured to detect, by using the generated equivalent channel related information, the received signal jointly transmitted by the plurality of relay stations.
  • the present invention enables the joint relay system to obtain array gain, and thus performs better in terms of bit error rate (BER) and packet error rate (PER); and, the scheme Applicable to any multiple relay stations participating in joint relay, and each relay station can be configured with any number of transmit antennas.
  • BER bit error rate
  • PER packet error rate
  • the overhead caused by the control signaling in the present invention is smaller; and the process of determining the baseband processing process and the weighting coefficient becomes more compact, thereby It is beneficial to reduce the processing complexity of relay stations, base stations and terminals.
  • FIG. 1b shows a schematic diagram of a joint relay network based on a closed loop manner in the prior art
  • FIG. 2 illustrates a multi-relay station combined with a next hop device transmission in a wireless communication network according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a joint relay network according to an embodiment of the present invention, wherein two relay stations transmit signals to a next hop device, and each of the two relay stations has a transmitting antenna;
  • 4a-4b are schematic diagrams of a joint relay network according to an embodiment of the present invention, wherein two relay stations transmit signals in conjunction with a next hop device, and one relay station is equipped with two transmit antennas, and the other relay station is provided with only one transmit antenna. Root transmit antenna
  • FIG. 5 is a schematic diagram of a joint relay network according to an embodiment of the present invention, wherein two relay stations transmit signals to a next hop device, and the two relay stations Each has two transmit antennas;
  • Figures 6a-6d are schematic illustrations of a joint relay network in which three relay stations transmit signals in conjunction with a next hop device, in accordance with an embodiment of the present invention.
  • FIG. 7 is a flow chart showing a method for transmitting signals to other relay stations in conjunction with a next hop device in a multi-antenna relay station of a wireless relay network, in accordance with an embodiment of the present invention
  • FIG. 8 is a flow chart showing a method for transmitting a signal to a next-hop device in conjunction with other relay stations in a single-antenna relay station of a wireless relay network, in accordance with an embodiment of the present invention
  • FIG. 9 is a flow chart showing a method for controlling a plurality of relay stations to transmit signals to a next hop device in a base station of a wireless relay network according to an embodiment of the present invention
  • FIG. 10 is a block diagram of a first joint transmitting apparatus for transmitting signals to other relay stations in conjunction with a next hop device in a multi-antenna relay station of a wireless relay network, in accordance with an embodiment of the present invention
  • FIG. 11 is a block diagram of a second joint transmitting apparatus for transmitting signals to other relay stations in conjunction with a next hop device in a single antenna relay station of a wireless relay network, in accordance with an embodiment of the present invention
  • FIG. 12 is a block diagram of a control device for controlling a plurality of relay stations to transmit signals to a next hop device in a base station of a wireless relay network according to an embodiment of the present invention
  • FIG. 13 is a flowchart showing a method for detecting a received signal jointly transmitted by a plurality of relay stations in a network device of a wireless relay network according to an embodiment of the present invention
  • Figure 14 is a block diagram showing a signal detecting apparatus for detecting a received signal jointly transmitted by a plurality of relay stations in a network device of a wireless relay network according to an embodiment of the present invention.
  • the transmission of the above-mentioned uplink signal is taken as an example.
  • Those skilled in the art can apply the present invention to the downlink signal transmission without creative labor according to the description of the uplink signal transmission herein.
  • FIG. 2 is a flow chart showing a system method for implementing a multi-relay station in conjunction with a next hop device in a wireless communication network in accordance with an embodiment of the present invention. The invention will now be described with reference to Figure 2 and in conjunction with Figures 3 - 5d, respectively.
  • FIG. 3 is a schematic diagram of a joint relay network according to an embodiment of the present invention, wherein two relay stations 1, 2 are combined with a next hop device, that is, base station 0, and both of the relay stations are equipped with only one transmission.
  • base station 0 is equipped with N r root receive antennas, where N r is a positive integer greater than or equal to one.
  • base station 0 provides a weighting coefficient b for the relay station 2 that needs to perform weighting on the signal.
  • the generation of b is based on the following criteria: Maximizing the received signal quality at base station 0.
  • the received signal quality may be characterized by one or more of the following information: received signal power (eg, RSSI, ie received signal strength indication information); ratio of received signal power to noise power ( SNR); ratio of received signal power to interference signal power (SIR); ratio of received signal power to noise power, sum of interference signal power (SINR).
  • the weighting coefficient b can be generated based on the following formula (1)
  • step S2 the mobile terminal A transmits a signal to each of the relay stations.
  • the mobile terminal A transmits a signal to each of the relay stations.
  • each relay station demodulates the transmission symbol ⁇ Xi, X 2 ... ⁇ (e.g., 16QAM modulation symbol) based on the received signal, and then forwards the signal to the base station 0 in step S4 in the following manner. :
  • the relay station 1 sends out on its transmitting antenna that the X relay station 2 sends bXi on its transmitting antenna;
  • relay station 1 sends X 2 on its transmit antenna and relay station 2 sends bX 2 on its transmit antenna.
  • the total M (in this example, the value of 2) of the signals to be transmitted at each relay station (the value in this example is 1) is to be sent to the base station 0 after being weighted.
  • the space-time coding is mainly taken as an example, and those skilled in the art can extend the present invention to the space-frequency coding without creative labor based on the teachings of the present application, and only need to refer to the above
  • a time slot is "replaced” with the first subcarrier, , , and the "second time slot” is replaced with “second subcarrier” accordingly.
  • the coherent coding is formed between the relay station 1 and the transmitting antenna of the relay station 2.
  • the meaning of group coherent coding as used herein is: Transmitting corresponding symbols on the same time slot/same subcarrier of different antennas (one of which may be weighted).
  • Equation (3) shows the decision signal to noise ratio (SNR Decisi. J: in the example shown in Fig. 3.
  • G diversity gain represents the diversity gain
  • G array gain represents the array gain.
  • Decision noise ratio (SNR Decisi. N. F ADSTC ) in FIG. 1 ADSTC following scheme Equation (4):
  • the present invention achieves an additional array gain and better system performance than the existing joint relay based solely on the open loop method.
  • the signaling overhead generated by the weighting coefficients transmitted between the base station 0 and each relay station is only 1 bit, which is smaller than the 4Q bits in the distributed precoding scheme shown in FIG. 1b, where Q represents each
  • the amount of feedback of the precoding coefficients saves the radio resources between the base station and the relay station.
  • the signal-to-noise ratio of the received signal can be maximized at the base station 0. Thereafter, in the receiver at the base station 0, the received signal can be detected according to the maximum ratio combining (MRC).
  • MRC maximum ratio combining
  • matching antennas a group of antennas that form a group coherent coding with each other are collectively referred to as matching antennas.
  • the matching antennas are located on different relay stations (as in the case shown in FIG. 3), if the relay stations 1, 2 transmit the same pilot signal to the base station 0 on the matched antenna, the channel response obtained by the receiver for channel estimation is obtained. In fact, it is a linear combination of the channel response between the physical receiving antenna and the transmitting antenna (the coefficient depends on the weighting coefficient b), in which case the receiver of the prior art can realize the support of the present invention.
  • the receiver needs to be improved for the present invention. Specifically, the improved receiver at the base station 0 is first based on the guides sent by the relay stations 1, 2 respectively.
  • the frequency signals P 2 and P 3 estimate the channel, and correspondingly obtain two channel response values, and then the receiver combines the weighting coefficient b used by the relay station 2 with the two channel response values to obtain an equivalent value according to the linear weighting calculation. Channel response for subsequent signal detection.
  • base station 0 directly informs relay station 2 of the weighting coefficient b used to perform the weighting.
  • the generation process of the weighting coefficient b is performed at the relay station 2. Specifically, in step 1, the base station 0 collects the channel between each of its receiving antennas and each transmitting antenna of each relay station. The related information is notified to the relay station 2, and the relay station 2 generates the weighting coefficient b as shown in the above formula (1).
  • each relay station is Symmetric channel
  • the channel estimation that should be performed by the receiver can also be performed by each relay station, and then each relay station will obtain channel related information between itself and base station 0, respectively, and thereafter, each relay station will The channel related information is summarized to the relay station 2, which in turn generates a weighting coefficient b according to equation (1).
  • a relay station operating in the open loop mode such as the relay station 1 in FIG. 3 is referred to as an open loop relay station
  • a relay station operating in a closed loop manner such as the relay station 2 in FIG. 3
  • a multi-antenna relay station that transmits a weighted processed signal on a part of the antenna and transmits an unweighted processed signal on the remaining antennas is called a composite relay station.
  • 4a is a schematic diagram of a joint relay network according to an embodiment of the present invention, wherein the relay stations 3, 4 transmit signals to the next hop device, and the relay station 3 is equipped with one transmitting antenna, and the relay station 4 is equipped with two transmitting signals. antenna. It can be seen that the relay station 3 is an open loop relay station, and the relay station 4 is a composite relay station.
  • base station 0 provides relay station 4 with a transmit antenna for the relay station 4 (referred to as TX-4-1, hereinafter, TX-m-n).
  • TX-4-1 a transmit antenna for the relay station 4
  • the form represents the weighting coefficient ⁇ of the weighted processing of the signal to be transmitted on the nth transmitting antenna of the relay station m.
  • step 3 After receiving the uplink signal sent by the mobile terminal A in step 2, in step 3, the relay station 3, 4 demodulates it to obtain a modulation symbol ⁇ XX ⁇ .. ⁇ , and then, the relay station 4 obtains the demodulated information.
  • the (space) coded signal is encoded (inter-time), and two signals to be transmitted, ie, ⁇ , ⁇ 2 ⁇ and ⁇ 2 *, - ⁇ , are obtained, and the weighting coefficients are utilized! ⁇ Weighting the signal sequence ⁇ X l 5 ⁇ 2 ⁇ to be transmitted on TX-4-1 to obtain a weighted signal sequence to be transmitted ⁇ b!X ⁇ 2 ⁇ .
  • step 4 the relay stations 3, 4 send the signal to be transmitted to the base station in the following manner.
  • the relay station 3 transmits the X l 5 relay station 4 to transmit on the TX-4-1 b, X, and send X 2 on TX-4-2;
  • the relay station 3 transmits X 2
  • the relay station 4 transmits b, X 2 on the TX-4-1 and transmits it on the TX-4-2 -
  • a distributed space-time coding is formed between the transmitting antenna of the relay station 3 and the TX-4_2 of the relay station 4, so that the coding gain can be obtained, and further, the transmitting antenna of the relay station 3 and the TX of the relay station 4 Between -4 - 1 also constitutes a group coherent coding, so that the array gain can be obtained.
  • the generation of the weighting coefficients bi in the embodiment shown in Fig. 4a depends on the channel-related information between the matching antenna (the transmitting antenna of the relay station 3 and the TX-4-1 on the relay station 4) and the receiving antennas of the base station 0, for example, If the received signal quality at the receiving end is maximized, equation (5) similar to equation (1) can still be used to determine b 1 ;
  • the signaling overhead involved in the weighting coefficients between base station 0 and the relay station is still 1 bit.
  • Figure 4b shows a schematic diagram of a joint relay network in accordance with an embodiment of the present invention, wherein the relay stations 5, 6 jointly transmit signals to the base station 0, and the relay station 5 is provided with two transmit antennas, and the relay station 6 is provided with only one transmission. antenna.
  • the two transmitting antennas TX-5-1 and TX-5-2 of the relay station 5 form a space-time coding
  • the TX-5-1 and the transmitting antenna of the relay station 6 form a coherent coding.
  • the coefficient b 2 used by the relay station 6 for weighting is generated based on channel-related information between the transmitting antenna of the relay station 6 and each receiving antenna of the base station 0 and channel-related information between the TX-5-1 and each receiving antenna of the base station 0, As shown in equation (6):
  • / « 5 represents channel-related information between TX-5_1 and the ith receiving antenna of base station 0, and / ⁇ represents channel-related information between the transmitting antenna of the relay station 6 and the ith receiving antenna of the base station 0. .
  • FIG. 5 is a schematic diagram of a joint relay network in accordance with an embodiment of the present invention, wherein the relay stations 7, 8 jointly transmit signals to the base station 0, and the two relay stations each have two transmit antennas.
  • the relay station 7 is an open loop relay station
  • the relay station 8 is a closed loop relay station.
  • TX-7-1 and TX-8-1, and between TX-7-2 and TX-8-2, respectively, constitute a group coherent coding.
  • the signals received at base station 0 are shown in matrix (7) in matrix form:
  • Equation (7) is equivalent to equation (8).
  • the receiver at base station 0 can use the Alamouti decoder to recover the modulation symbols X,, X 2 .
  • the weighting coefficients b 3 and b 4 can be determined according to equation (9):
  • Rs ij represents channel related information between the jth transmit antenna of the relay station 7 and the ith receive antenna of the base station
  • ⁇ 8 - represents the jth transmit antenna of the relay station 8 and the ith receive antenna of the base station 0 Channel related information.
  • b 3 based on a TX-8- 1 and each base station associated with the channel 0 between the respective receiving antenna information 7- TX-matching of the antenna to generate
  • the weighting coefficient transfer between the base station 0 and each relay station occupies only 2 bits, which is far superior to the simple closed-loop scheme in the prior art.
  • FIG. 5 only shows a joint relaying scheme when two relay stations are equipped with two transmitting antennas, and the protection scope of the present invention also covers a plurality of variations of the situation shown in FIG. 5, such as The relay station 7 also performs weighting processing on the signal to be transmitted on one of the transmitting antennas, and the like. No longer.
  • the present invention is equally applicable to the case where two or more relay stations transmit signals to the next hop device, which will be described below with reference to Fig. 2 and in conjunction with Figs. 6a-6d.
  • the three relay stations ⁇ - ⁇ are only equipped with one transmitting antenna, wherein the transmitting antennas of the relay stations I and II form a distributed space-time coding, and between the transmitting antennas of the relay stations I and III. Then constitute a group of coherent coding.
  • the generation of the weighting coefficient b 5 depends on the channel-related information between the respective receiving antennas of the transmitting antennas I and III constituting the matching antennas and the base station 0, and the determination scheme thereof Can be based on the idea of equation (5), ie, will be among them!
  • Replace with b 5 replace R S3 with KRSI, and replace k i, RS 4 with RSJJ.
  • the relay stations I, II operate in the same manner as in Fig. 6a, except that the relay station III and the relay station II form a group coherent coding based on the configuration of the matching antenna.
  • the channel-related information between the transmitting antennas of the relay stations II and III and the receiving antennas of the base station 0 respectively generates b fi based on the idea of the equation (5).
  • a coherent coding is formed between the relay station I and the transmitting antenna of the relay station IV, wherein the weighting coefficient b 7 used by the relay station IV is based on channel-related information between the transmitting antennas of the relay stations I and IV and the receiving antennas of the base station 0.
  • b 8 is determined based on the idea of equation (5), that is, replacing it with b 8 , then replacing / ⁇ 3 with h i, RS -1 + b 7 ⁇ h i, RS-IV, and h i, RS 4 is replaced by R S-V.
  • the relay station VI is equipped with two transmit antennas, which respectively form a group coherent coding with the relay stations I and II.
  • the weighting coefficients b 9 and b 1 () please refer to the description above.
  • the principle may be to ensure that the signal transmitted by the first transmitting antenna of the relay station I and the relay station VI and the signal transmitted by the second transmitting antenna of the relay station II and the relay station VI are respectively maximized at the base station 0.
  • the present invention can be extended to a case where one relay station has three or more transmitting antennas, and will not be described herein.
  • relay station 4 in Figure 4a it is equipped with two transmit antennas TX-4J and TX-4-2.
  • step S10 the relay station 4 obtains a weighting coefficient b,.
  • the step S10 has the following two specific implementation manners:
  • Method 1 Obtain weighting coefficients from base station 0
  • the base station 0 is responsible for the channel based on the channel between it and the relay stations 3, 4 (including the channel between its receiving antenna and the transmitting antenna of the relay station 3, and the channel between its receiving antenna and the ⁇ _4-1). Related information is generated to generate b! and notified to relay station 4.
  • step S10 is implemented by the following sub-steps (not shown):
  • S100 the relay station 4 obtains, by the base station 0, channel related information for generating ⁇ ;
  • S101 the relay station 4 generates b l Q based on the obtained channel related information.
  • S10 may also be implemented by the following sub-steps, where the sub-steps are particularly applicable when the channel is a symmetric channel: S100': the relay station 4 performs channel estimation, obtains channel-related information between the TX-4_1 and the base station 0, and performs channel estimation by the relay station 3 and directly informs or passes the channel-related information between the obtained relay station 3 and the base station 0. 0 indirectly informs the relay station 4;
  • the relay station 4 generates b based on the obtained channel related information.
  • the relay station 4 After receiving the uplink signal from the mobile terminal A, the relay station 4 demodulates it to obtain a modulation symbol stream 3 ⁇ 4 , 2 , X 3 , X 4 , .... ⁇ , based on the prior configuration, in step S1 1
  • the relay station 4 performs space-time coding on the demodulated symbol stream. Taking ⁇ X, X 2 ⁇ as an example, the relay station 4 will obtain two space-time-coded symbols ⁇ X h X 2 ⁇ and ⁇ X 2 *, -X,* ⁇ .
  • step S10 when the channel between the relay station 4 and the base station 0 is a time varying channel, the method preferably periodically performs step S10 and updates bl in time to ensure higher signal quality at the receiving end.
  • the execution period of step S10 can be long, and even the relay station 4 does not execute until the channel condition is changed for other reasons, after the b! Step S10. It can be seen that step S10 is saveable, and there is no strict time sequence between step S10 and step S1 1.
  • step S 12 the weighting coefficients relay station 4 by step S10 obtained in 1 ⁇ for one signal to be transmitted on TX-4J weighted generate way weighted signal ⁇ b! X "b, X 2 ⁇ .
  • step S13 the relay station 4 transmits a signal to be transmitted to the base station 0 along with the relay station 3.
  • a multi-antenna relay station spatially encodes a signal to be processed, and transmits a signal in the form of spatial diversity or spatial multiplexing, wherein one or more signals are transmitted after being weighted.
  • Figure 8 is a flow chart showing a method for transmitting signals to other relay stations in conjunction with a next hop device in a single antenna relay station of a wireless relay network, in accordance with an embodiment of the present invention.
  • a second aspect of the present invention will be described with reference to Fig. 8 in conjunction with Figs. 6a and 6b. Take the single-antenna relay station III in Figure 6a as an example.
  • step S20 the relay station III obtains a weighting coefficient b 5 in a manner similar to that of the multi-antenna relay station described above, in which the weighting coefficient is obtained, that is, it can be directly generated by the base station 0.
  • the generated b 5 is sent to the relay station III, and the base station 0 can also provide the relay station III with the channel related information between the relay station I and the base station 0 and the channel related information between the relay station ⁇ and the base station 0, and then the relay station III generates the b 5 .
  • the generating process of the b 5 is preferably based on a received signal quality maximization criterion of the receiving end (base station 0), the received signal quality comprising any one or any of the following: received signal power; received signal power Ratio to noise power; ratio of received signal power to interference signal power; ratio of received signal power to sum of noise power and interference signal power.
  • the relay station performs weighting processing on the ⁇ X h X 2 ⁇ of the weighting process to generate ⁇ bgX bsXz ⁇ , that is, the signal to be transmitted which is weighted and processed.
  • the relay station III transmits bsXj, b 5 X 2 to base station 0 on two time slots of its transmitting antenna, respectively.
  • step S20 is preferably adjusted according to the time-varying characteristics of the channel.
  • the execution of step S20 is frequent, and vice versa. Step S20 is performed every other considerable time.
  • step S20 which is obtained using (b 6).
  • the step S21 includes an The illustrated step, wherein the relay station III performs the space time encoding operation.
  • the relay station III performs weighting processing on ⁇ - ⁇ , ⁇ 2 * ⁇ to be subjected to the weighting processing to generate ⁇ -b 6 xr, b 6 X ⁇ , that is, a signal to be transmitted which is subjected to weighting processing.
  • the relay station III transmits the one-way weighted signal to be transmitted generated by the relay station III to the base station 0 together with the relay stations I and II.
  • Figure 9 is a flow diagram showing a method for controlling a plurality of relay stations to transmit signals to a next hop device in a base station of a wireless relay network in accordance with an embodiment of the present invention.
  • the method provided by the third aspect of the present invention will be described with reference to Fig. 9 in conjunction with Fig. 4a.
  • base station 0 can provide b for relay station 4 as well as The channel-related information is provided for its own generation b!, which are discussed as follows:
  • Base station 0 is provided for relay station 4
  • the operation performed at the base station 0 is identical to that of FIG. 9, that is, first, channel-related information between the base station 0 and each of the illustrated relay stations is acquired in step S30, according to a specific embodiment of the present invention, mainly Channel-related information between each receiving antenna of the base station 0 and the transmitting antenna of the relay station 3, and channel-related information between each receiving antenna of the base station 0 and TX-4-1 on the relay station 4 are obtained.
  • the specific manner is as follows: channel estimation and the like.
  • step S31 the base station 0 generates b based on the channel related information acquired in step S31.
  • the manner of generation can refer to the related content described for the system method.
  • the base station 0 notifies the relay station 4 of the notification generated by the relay station 4.
  • Base station 0 provides channel related information for relay station 4
  • the step S31 shown in FIG. 9 is saveable. After the base station obtains the channel-related information between the base station and the relay stations 3 and 4, the base station does not need to generate b l 5 to directly inform the relay station 4 of the channel-related information obtained. .
  • the next hop device of each relay station in the figure is a mobile terminal.
  • the channel between the receiving antenna and the transmitting antennas of the relay stations 3, 4 can be estimated by the mobile terminal A and reported to the base station 0, and then the base station 0 generates b! based on this, or is selected by the base station 0. Generate b, the required channel related information and provide it to the relay station 4.
  • the base station 0 also informs the mobile terminal A of the weighting coefficient generated by the relay station 4.
  • the first joint transmitting apparatus 10 shown in FIG. 10 includes: a first weighting apparatus 100, a first signal transmitting apparatus 101, a first spatial encoding apparatus 102, and a first weighting coefficient obtaining means 103.
  • the first weighting coefficient obtaining device 103 specifically includes: a first weighting information acquiring device 1030 and a first auxiliary obtaining device 1031. It will be appreciated by those skilled in the art that the apparatus for use in the first joint transmitting device 10 in accordance with various embodiments of the present invention is shown in FIG. 10 for convenience. For a particular embodiment, the various sub-devices shown in FIG. There may be one or more signal co-delivery processes that do not participate in this particular embodiment.
  • the first weighting coefficient obtaining means 103 at the relay station 4 obtains the weighting coefficient b l D which is obtained in the following two ways:
  • base station 0 is responsible for the channel between it and the relay stations 3, 4 (including the channel between its receiving antenna and the transmitting antenna of relay station 3, and the channel between its receiving antenna and TX-4-1)
  • the channel related information is generated and notified to the relay station 4.
  • the first weighting information obtaining means 1030 is obtained by the weighting coefficient related information obtained at the base station 0, that is, the weighting coefficient ⁇ . It can be seen that in the mode 1, the first auxiliary obtaining device 1031 is saveable.
  • each sub-device of the first weighting coefficient obtaining means 103 operates in the following manner:
  • the first weighting information obtaining means 1030 first obtains, by the base station 0, channel-related information for generation;
  • the first auxiliary obtaining means 1031 generates b] based on the obtained channel related information according to the above formula (1).
  • each of the foregoing sub-devices may also be obtained by performing the following operations: b.
  • the following operations are particularly applicable when the channel is a symmetric channel:
  • the first weighting information obtaining means 1030 acquires channel-related information (eg, by channel estimation), acquires channel-related information between the TX-4-1 and the base station 0, and performs channel estimation by the relay station 3 to acquire between the relay station 3 and the base station 0.
  • Channel related information, the acquired channel related information is concentrated to the first auxiliary obtaining device 1031;
  • the first auxiliary obtaining means 1031 generates b based on the obtained channel related information.
  • the relay station 4 After receiving the uplink signal from the mobile terminal A, the relay station 4 demodulates it to obtain a modulation symbol stream ⁇ X!, X 2 , X 3 , X 4 , .... ⁇ based on a pre-configured coding scheme.
  • the first spatial coding device 102 performs space-time coding on the demodulated symbol stream, taking ⁇ XX 2 ⁇ as an example, and the space-time coded symbol will obtain two space-time coded symbols ⁇ X l5 X 2 ⁇ And ⁇ X,
  • the first weighting coefficient obtaining means 103 periodically obtains the to-be-added on the TX-4J.
  • the weighting coefficient of the weighting signal is processed to ensure a higher signal quality at the receiving end.
  • the execution period of the obtaining operation of the weighting coefficient may be long, even after the relay station 4 obtains the weighting coefficient once, that is, the channel condition is due to other reasons. The obtaining operation is no longer performed until a change occurs.
  • the operations of the first weighting coefficient obtaining means 103 and the first spatial encoding means 102 are not strictly chronological.
  • the first weighting device 100 uses the first weighting coefficient to obtain the weighting coefficient obtained by the device 103 to weight a signal transmitted on the TX-4_1 to generate a signal.
  • the generated weighted processed signal is transmitted by the first signal transmitting device 101 to the base station 0 along with the relay station 3.
  • a multi-antenna relay station spatially encodes a signal to be processed, and transmits a signal in the form of spatial diversity or spatial multiplexing, wherein one or more signals are transmitted after being weighted.
  • Figure 11 is a block diagram of a second joint transmitting device for transmitting signals to other relay stations in conjunction with a next hop device in a single antenna relay station of a wireless relay network, in accordance with an embodiment of the present invention.
  • the second joint transmitting device 20 shown includes: a second weighting device 200 , a second signal transmitting device 201, a second spatial encoding device 202, and a second weighting coefficient obtaining device 203.
  • the second weighting coefficient obtaining device 203 specifically includes: a second weighting information acquiring device 2 030 and a second auxiliary obtaining device 2031. It will be understood by those skilled in the art that the apparatus for use in the second joint transmitting apparatus 20 according to various embodiments of the present invention is shown in FIG. 11 for convenience. For a specific embodiment, each of the sub-devices shown in FIG. There may be one or more signal co-delivery processes that do not participate in this particular embodiment.
  • the second weighting coefficient obtaining means 203 at the relay station III obtains the weighting coefficient b 5 in the same manner as the multi-antenna relay station obtains the weighting coefficient, that is, the generated b 5 can be directly sent by the base station 0 to the relay station III, and
  • the second weight information acquisition device obtains, preferably, B 5 is generated based on the idea of the above formula (5).
  • the channel-related information between the relay station 1 and the base station 0 and the channel-related information between the relay station III and the base station 0 may also be provided by the base station 0 for the relay station III, and the channel-related information is obtained by the second weight information acquiring device 2030 and then provided to the first
  • the second auxiliary obtaining means 2031 generates a b 5 based on the channel related information.
  • the generating process of b 5 is preferably based on maximizing the received signal quality of the receiving end (base station 0 ), the received signal quality comprising any one or more of the following: receiving signal power; receiving signal power and The ratio of the noise power; the ratio of the received signal power to the interference signal power; the ratio of the received signal power to the sum of the noise power and the interference signal power.
  • the obtained weighting coefficient b 5 is supplied to the second weighting device 200, and the second weighting device 200 weights the ⁇ , X 2 ⁇ to be weighted to generate ⁇ b 5 X h b 5 X 2 ⁇ , that is, all the way The signal to be sent. Subsequently, the signals to be transmitted b 5 Xi, b 5 X 2 are respectively transmitted by the second signal transmitting means 201 to the base station 0 on two time slots of the relay station ⁇ transmit antenna.
  • the frequency obtained by the second weighting coefficient obtaining means 203 preferably refers to the time-varying characteristic of the channel, and when the channel time-varying is strong (the channel-related information changes faster with time), it is more frequent, and vice versa.
  • the weighting coefficient obtaining process can be performed once every other relatively long time.
  • the second spatial encoding device 202 is saveable. 6b again to FIG ⁇ an example relay station, the relay station III Similarly, it can also be obtained using the second weighting coefficient weighting means 203 obtains coefficients (b 6).
  • the relay station III needs to perform space time coding on the signal ⁇ X,, X 2 ⁇ to be processed by the second spatial coding means 202 thereon, and uses the generated ⁇ - ⁇ , ⁇ 2 * ⁇ for transmission.
  • the generated ⁇ - ⁇ X ⁇ is supplied to the second weighting device 200, which performs weighting processing of ⁇ - ⁇ , X ⁇ to be weighted by b6 to generate ⁇ -b 6 x , b 6 X ⁇ , that is, all the way The signal to be sent. Subsequently, the second signal transmitting means 201 transmits the generated ⁇ -b 6 X , b 6 X 2 * ⁇ to the base station 0.
  • the illustrated control device 30 includes an acquisition device 300, a generation device 301, and a notification device 302.
  • base station 0 can provide b for relay station 4 as well as The channel-related information is provided for its own generation bj, which are discussed as follows:
  • Base station 0 is provided for relay station 4
  • the acquisition device 300 captures channel related information between the base station 0 and each relay station shown.
  • the receiving antennas of the base station 0 and the transmitting antennas of the relay station 3 are mainly acquired.
  • the specific method is as follows: channel estimation and the like.
  • the generating device 301 generates b according to the channel-related information acquired by the obtaining device 300, and the manner of generating may refer to the related content described for the system method.
  • the notification generated by the relay station 4 is notified to the relay station 4 by the notifying means 302.
  • Base station 0 provides channel related information for relay station 4
  • the generating means 301 shown in FIG. 12 is saveable. After the obtaining means 300 obtains the channel-related information between the base station 0 and the relay stations 3, 4, the obtained channel is directly required by the notifying means 302. The relay station 4 is informed of the relevant information.
  • the next hop device of each relay station in the figure is a mobile terminal.
  • the channel between the receiving antenna and each transmitting antenna of the relay station 3, 4 can be estimated by the mobile terminal A and reported to the base station 0, and then the base station 0 generates b based on this or selects b from the base station 0 to generate b.
  • the required channel related information is provided to the relay station 4.
  • the base station 0 also informs the mobile terminal A of the weighting coefficient bl generated by the relay station 4, specifically by a child not shown in FIG. The device is done.
  • Figure 13 is a flow chart showing a method for detecting a received signal jointly transmitted by a plurality of relay stations in a network device of a wireless relay network in accordance with an embodiment of the present invention.
  • step S40 the base station 0 estimates the channel response between each of its receiving antennas and all the transmitting antennas of all the relay stations, and then combines the channel responses of the matched antennas. Corresponding linear weighted combination of the weighting coefficients should be used to obtain the corresponding equivalent channel response.
  • step S41 the base station 0 detects the received signal based on the generated equivalent channel response, thereby restoring the original modulation symbol X, X 2 .
  • FIG 14 is a block diagram showing a signal detecting apparatus for detecting a received signal jointly transmitted by a plurality of relay stations in a network device of a wireless relay network according to an embodiment of the present invention.
  • the illustrated signal detecting device 40 includes an equivalent generating device 400 and a detecting device 401.
  • the equivalence generating device 400 estimates the channel response between each receiving antenna of the base station 0 and all the transmitting antennas of all the relay stations, and then combines the channel responses of the matched antennas with the corresponding weighting coefficients to obtain corresponding correspondences. Equivalent channel response.
  • the detecting means 401 detects the received signal based on the generated equivalent channel response, thereby restoring the original modulation symbol X!, X 2 .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

L'invention propose un nouveau type de schéma de relais combiné. Une pluralité de stations relais prenant part dans le relais combiné exécutent une opération de pondération pour les signaux de N liaisons dans un total de M liaisons, génèrent les signaux de N liaisons qui ont subi l'opération de pondération et doivent être transmis, et les signaux de M-N liaisons qui n'ont pas subi l'opération de pondération et doivent être transmis, et les transmettent au dispositif de saut suivant de façon conjointe. De ce fait, le schéma est différent du simple mode en boucle ouverte ou en boucle fermée dans la technique existante et permet d'obtenir une combinaison des deux. Par comparaison au mode en boucle ouverte, par exemple ADSTC, le schéma de la technique peut obtenir un gain de groupement, et l'efficacité du système seront meilleure ; et par comparaison au mode en boucle fermé, par exemple un pré-codage distribué, le surdébit apporté par le signal de commande est inférieur, et l'opération de traitement en bande de base et l'opération de détermination des facteurs de pondération sont plus simples.
PCT/CN2007/002817 2007-09-25 2007-09-25 Procédé et appareil de relais combiné pour une pluralité de stations relais dans un réseau de communication sans fil WO2009039678A1 (fr)

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PCT/CN2007/002817 WO2009039678A1 (fr) 2007-09-25 2007-09-25 Procédé et appareil de relais combiné pour une pluralité de stations relais dans un réseau de communication sans fil

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020063597A1 (fr) * 2018-09-29 2020-04-02 华为技术有限公司 Procédé et dispositif de communication

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102340380A (zh) * 2010-07-23 2012-02-01 中兴通讯股份有限公司 一种基于有限反馈预编码的协作中继传输方法和系统
CN102420679B (zh) * 2011-09-30 2014-11-19 北京邮电大学 基于中继协同预编码的多用户双向通信方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123611A1 (de) * 2001-05-15 2002-11-21 Siemens Ag Verfahren zum Betreiben eines zellularen Funk-Kommunikationsystems und Stationen dafür
CN101001098A (zh) * 2006-01-12 2007-07-18 华为技术有限公司 一种中继站转发下行信号的方法及其设备

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006047909A1 (fr) * 2004-11-04 2006-05-11 Huawei Technologies Co., Ltd. Procede pour ameliorer a l'aide d'une retroaction les performances de diversite d'emission d'un systeme a multiples entrees et multiples sorties
CN1996786A (zh) * 2006-11-29 2007-07-11 北京邮电大学 基于中继技术的新型无线通信组网方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123611A1 (de) * 2001-05-15 2002-11-21 Siemens Ag Verfahren zum Betreiben eines zellularen Funk-Kommunikationsystems und Stationen dafür
CN101001098A (zh) * 2006-01-12 2007-07-18 华为技术有限公司 一种中继站转发下行信号的方法及其设备

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020063597A1 (fr) * 2018-09-29 2020-04-02 华为技术有限公司 Procédé et dispositif de communication
US11271615B2 (en) 2018-09-29 2022-03-08 Huawei Technologies Co., Ltd. Communications method and apparatus

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